From 46374eaa642939b65dcc095a9c6caeaa49248cdf Mon Sep 17 00:00:00 2001
From: Bob Arnson <bob@firegiant.com>
Date: Thu, 3 Jan 2019 15:00:09 -0500
Subject: Prevent linker NullReferenceExceptions when missing
 SourceLineNumbers.

---
 src/WixToolset.Core/Link/ResolveReferencesCommand.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/WixToolset.Core/Link/ResolveReferencesCommand.cs b/src/WixToolset.Core/Link/ResolveReferencesCommand.cs
index 0188f9ac..07eabbd6 100644
--- a/src/WixToolset.Core/Link/ResolveReferencesCommand.cs
+++ b/src/WixToolset.Core/Link/ResolveReferencesCommand.cs
@@ -95,7 +95,7 @@ namespace WixToolset.Core.Link
                     else // display errors for the duplicate symbols.
                     {
                         var accessibleSymbol = accessible[0];
-                        var referencingSourceLineNumber = wixSimpleReferenceRow.SourceLineNumbers.ToString();
+                        var referencingSourceLineNumber = wixSimpleReferenceRow.SourceLineNumbers?.ToString();
 
                         if (String.IsNullOrEmpty(referencingSourceLineNumber))
                         {
-- 
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